基于COMSOL有限元法的电涡流传感器仿真

Simulation of eddy current sensor based on COMSOL finite element method

为了研究电涡流传感器中电涡流探头线圈的结构参数对检测性能的影响,以电磁场理论为基础,采用有限元分析法,以有限元仿真软件COMSOL为工具,建立电涡流传感器的检测模型,通过仿真研究电涡流传感器探头的电磁特性和影响其性能的探头线圈内径、外径、厚度等结构参数.结果表明:电涡流传感器探头线圈的电阻值与电抗值随线圈内径和外径的增大及厚度的减少而呈上升趋势,当内径和外径越大、厚度越小时,电涡流传感器的灵敏度越高,且线圈厚度对传感器灵敏度的影响更明显.研究结果对研制用于钢闸门缺陷检测的电涡流传感器的优化设计具有一定的参考价值.

To study the effects of structural parameters of probe coil in eddy current sensor on the performance detection,based on electromagnetic field theory,the finite element analysis was employed,with the help of finite element simulation software COMSOL to establish the detection model of eddy current sensor. By means of simulation,the electromagnetic characteristics of eddy current sensor probe and probe coil,and such structural parameters affecting its performance as inner radius,outer radius,thickness were studied. The results show that the impedance of eddy current sensor probe coil rises with the increase of the coil inner radius and outer radius,and the decrease of thickness. The bigger the inner radius,the outer radius and the thinner the thickness are,the higher the sensitivity of the eddy current sensor is,and the more obvious the impact of its thickness on the sensitivity of the sensor is. The findings offer a certain reference value for optimizing design of eddy current sensor used to defect detection of steel gate.